CN102069307B - Method for welding bottom plate of large flat-bottom storage tank - Google Patents
Method for welding bottom plate of large flat-bottom storage tank Download PDFInfo
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- CN102069307B CN102069307B CN2010105094416A CN201010509441A CN102069307B CN 102069307 B CN102069307 B CN 102069307B CN 2010105094416 A CN2010105094416 A CN 2010105094416A CN 201010509441 A CN201010509441 A CN 201010509441A CN 102069307 B CN102069307 B CN 102069307B
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Abstract
The invention discloses a method for welding a bottom plate of a large flat-bottom storage tank, which has the advantage of simple processing process and can effectively reduce the welding deformation of the bottom plate of the large flat-bottom storage tank, improve the evenness of the bottom plate and prolong the service life of the storage tank, solving the technical problems of large bottom plate deformation, poor storage tank strength and rigidity, service life reduction, and the like in the prior art. The method mainly comprises the following steps of: butt jointing or lap jointing a plurality of steel plates to form a bottom plate of a round flat-bottom storage tank; then paving a plurality of fan-shaped steel plates around the circumference of the bottom plate of the flat-bottom storage tank to form an annular edge plate; partially welding adjacent fan-shaped steel plates from outside to inside; then coaxially putting cylindrical wall plates; and welding according to a welding sequence of spot fixing and welding from outside to inside.
Description
Technical field
The present invention relates to a kind of welding method, relate in particular to a kind of welding deformation that can effectively reduce large-scale flat storage tank bottom plate, improve the large-scale flat storage tank bottom plate welding method of base plate flatness.
Background technology
Traditional welding method between large-scale flat storage tank bottom plate and base plate and wallboard does; At first prefabricated some center plates and some blocks of scallop balsh plates; Then center plate is overlapped to link to each other one by one and constitute circular flat storage tank bottom plate shape; With the cylindrical tiling of scallop balsh plate along flat storage tank bottom plate, scallop balsh plate is weldingly connected one by one forms the annular edge listrium then again, adjacent center plate again is weldingly connected; The annular edge listrium welds with flat storage tank bottom plate circumference again, at last wallboard is vertically welded in the top of annular edge listrium.Adopt above-mentioned welding method to cause the bottom deformation amount big, not only influence the outward appearance of storage tank, and because the residual stress that produces in the welding process fails to obtain to discharge and eliminate, cause storage tank intensity and rigidity to reduce, service life is short.
Chinese patent discloses the welding method and the weldment (CN1360991A) thereof of a kind of high-pressure bottle bottom (head) and skirt; Its process roughly comprises: between bottom (head) and skirt, make an annular element of stretching rake angle in having as intermediate weldment; Will in stretch rake angle and be inverted and be enclosed within on the bottom (head) circle ring lower angle weld seam between welding rake angle and the bottom (head), postwelding upset back chipping; Weld the circle ring upper corners weld seam between main body upper end and the bottom (head) again; At last skirt is enclosed within on the baffle ring that stretches out inboard, main body lower end narrow outer wide groove in forming, back chipping behind the circumferential welded seam at bevel for welding place then downwards between the two.Though it is simple that this kind welding method has process, efficient advantages of higher, this kind welding method only are applicable to that base plate is the welding of all-in-one-piece small containers; The large-scale flat storage tank that is spliced by dried piece center plate for base plate; Still exist the bottom deformation amount big, not only influence the outward appearance of storage tank, and because the residual stress that produces in the welding process fails to obtain release and elimination; Cause storage tank intensity and rigidity to reduce, technical problem such as service life is short.
Summary of the invention
It is simple that the present invention has mainly provided a kind of process; Can effectively reduce the welding deformation of large-scale flat storage tank bottom plate, improve the flatness of base plate, thereby increase the intensity and the rigidity of storage tank; The large-scale flat storage tank bottom plate welding method that has prolonged storage tank service life; It is big to have solved the bottom deformation amount that exists in the prior art, not only influences the outward appearance of storage tank, and because the residual stress that produces in the welding process fails to obtain release and elimination; Cause storage tank intensity and rigidity to reduce, the technical problem that service life is short etc.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals: large-scale flat storage tank bottom plate welding method comprises the steps:
1) prefabricated some center plates, and form the circular flat bottom storage tank bottom plate by some center plates tiling butt joint or overlap joint back, and be corresponding to the base plate seam between adjacent center plate and be dislocatedly distributed, more adjacent center plate spot welding is fixed;
2) prefabricated some blocks of scallop balsh plates, with the cylindrical tiling back formation annular edge listrium of scallop balsh plate along flat storage tank bottom plate, the inner ring surface of said annular edge listrium and the outer ring surface of flat storage tank bottom plate are complementary again;
3) the fanning strip seam along adjacent scallop balsh plate begins inwardly partly to weld one by one adjacent scallop balsh plate from the outside of annular edge listrium;
4) get that the cylindrical shape wallboard is coaxial to be placed on the annular edge listrium, and the weld length between fan-shaped edge steel plate extends to the inboard of wallboard in the step 3), carry out the discontinuous welding and form the short weld seam of plurality of sections between itself and annular edge listrium in the outside of wallboard;
5) corresponding outer shroud seam between adjacent short weld seam described in the repair welding step 4) one by one makes the end to end formation afterwards of short weld seam one closed circle between wallboard and annular edge listrium;
6) carry out the discontinuous welding and form the short weld seam of plurality of sections between itself and annular edge listrium in the inboard of wallboard, corresponding interior articulating seam between the adjacent short weld seam of repair welding one by one again, make short weld seam between wallboard and annular edge listrium end to end after formation one closed circle;
7) remaining fanning strip seam between the adjacent scallop balsh plate in the repair welding step 3) one by one;
8) with carrying out the discontinuous welding between flat storage tank bottom plate and annular edge listrium and forming the short weld seam of plurality of sections; The corresponding outer seam of base plate between the adjacent short weld seam of repair welding one by one makes the end to end formation afterwards of short weld seam one closed circle between flat storage tank bottom plate and annular edge listrium again;
9) with carrying out discontinuous welding between some center plates on the flat storage tank bottom plate and form the short weld seam of plurality of sections, during when intersecting appears in the base plate seam of adjacent center plate, the base plate seam of cross section is directly carried out part and is welded; Corresponding base plate seam between the adjacent short weld seam of repair welding one by one makes the end to end back formation of short weld seam one closed circle on the every center plate again;
Wherein step 1) and step 2) can exchange, step 3) to step 9) is in step 1) and step 2) carry out in proper order afterwards.At first prefabricated some center plates; And with its tiling back dislocation butt joint or dislocation lap joint formation circular flat bottom storage tank bottom plate; Each adjacent center plate is fixed in spot welding again; Can prevent that thus center plate position in welding process is moved, weld seam dislocation is laid and can be avoided the excessive and stress of base plate local deformation to concentrate again; The annular edge listrium that is spliced by some blocks of scallop balsh plates is tiled in flat storage tank bottom plate cylindrical, and earlier along a fanning strip seam ecto-entad welding part, promptly whole piece fanning strip seam is not that disposable weldering is intact; Make the annular edge listrium medial extremity plane that does not have welding keep smooth thus, get the coaxial top that is placed on the annular edge listrium of wallboard again, and guarantee that the attachment weld between the annular edge listrium extends to the inboard of wallboard; Adopt the method welding wallboard outer shroud seam corresponding of discontinuous welding then with the annular edge listrium, the discontinuous welding promptly outside articulating sew on welding and form several weak point weld seams, have certain interval between the weak point weld seam; Carry out repair welding afterwards again; Even sealing welding ring that each has lacked the end to end formation one of weld seam is at first welded the outer shroud seam, the annular edge listrium is stretched out under the effect of welding stress; Thereby guarantee that the inboard annular edge listrium of wallboard keeps smooth; And the short weld seam of segmented in discontinuous when welding not only plays the effect of location, the more important thing is the rigidity that has strengthened base plate, farthest to have overcome welding deformation; When connecting each short weld seam afterwards again and forming the sealing welding ring; Because the relative position between wallboard and the annular edge listrium is fixing, and is broken down into independently pocket, so welding stress reduces the relative deformation of the two; Between the interior articulating seam that in like manner wallboard is corresponding with the annular edge listrium, flat storage tank bottom plate and annular edge listrium, the method that all adopts discontinuous to weld between center plate is equal, realized same effect thus; In like manner from inside to outside welding sequence can make corresponding parts under the effect of welding stress, stretch out, thereby guarantees that inboard corresponding not welding portion keeps smooth, and process is simple; The back is interior outside the above-mentioned thus elder generation, the solid welding method of welding again of point has farthest reduced welding deformation earlier; Improve the flatness of base plate; Simultaneously in welding process since stress in the unanimity that is evenly distributed of all directions; Therefore most of residual stress is released or offsets, thereby has increased the intensity and the rigidity of storage tank, has prolonged the service life of storage tank.
As preferably, weld length accounts for 1/3 to 1/2 of whole piece fanning strip seam length in the said step 3).The long deflection of weld length increases, and does not have the effect of location when weld length is too short, because wallboard is pressed on the seam of not welding, causes the seam of wallboard lower end to weld simultaneously, thereby reduces the intensity of annular edge listrium.
As preferably, be 50mm to 150mm corresponding to the single short fusion length of being interrupted welding in the said step 4), adjacent short weld spacing is 3 to 6 times of single short fusion length.The long deflection of short fusion length increases, and short fusion length does not have the effect of location when too short.
Center plate can be multiple shapes such as square, rhombus, triangle, and as preferably, said center plate is a rectangular steel plates, at first welds the length direction of center plate in the said step 9), welds the width of center plate again; Every section fusion length of corresponding cross section was 30mm to 50mm when intersecting appearred in the base plate seam.Center plate adopts the rectangle section bar steel plate of standard, need not secondary operations, cuts down finished cost; The welding sequence of width is to help reducing welding deformation amount equally behind elder generation's length direction; Seam cross section welding 30mm to 50mm is the position for fixing adjacent center plate equally, reduces welding deformation amount.
As preferably, in said step 8), between said wallboard and flat storage tank bottom plate, increase diagonal brace, the two ends of diagonal brace spot welding respectively are fixed on the inner ring surface of wallboard and on the flat storage tank bottom plate, and diagonal brace and flat storage tank bottom plate angle are 45 ° to 60 °.Through between wallboard and flat storage tank bottom plate, diagonal brace being set, can relying on the overhead power of diagonal brace to resist the flat storage tank bottom plate that welding stress causes and upwarp distortion.
As preferably, horizontal weight above said flat storage tank bottom plate, and make weight across between adjacent center plate.Through on flat storage tank bottom plate, placing weight, be to resist the flat storage tank bottom plate that welding stress causes to upwarp distortion through the pressure of weight equally.
As preferably, continuous hammering weld seam in welding process.The residual stress on the weld seam can eliminated or reduce to the hammering weld seam.
Therefore; Large-scale flat storage tank bottom plate welding method of the present invention has following advantage: outer earlier back is interior, elder generation lacks afterwards the welding method of growing (point is solid earlier welds again) and farthest reduced welding deformation; The base plate flatness can improve about 30%, because above-mentioned welding method can make the be evenly distributed unanimity of stress in all directions, therefore most of residual stress is released or offsets simultaneously; Thereby increased the intensity and the rigidity of storage tank, prolonged the service life of storage tank.
Description of drawings:
Fig. 1 is the vertical view of the large-scale flat storage tank among the present invention.
Fig. 2 is the sketch map that removes wallboard shown in Figure 1.
Fig. 3 is that A shown in Figure 2 is in completing steps 4) time enlarged drawing.
Fig. 4 is that A shown in Figure 2 is in completing steps 6) time enlarged drawing.
Fig. 5 is that B shown in Figure 2 is in completing steps 9) time T font intersect the enlarged drawing of base plate seam.
Fig. 6 is the longitudinal sectional view of the large-scale flat storage tank among the present invention.
The specific embodiment:
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
As shown in Figure 1, large-scale flat storage tank bottom plate welding method of the present invention comprises the steps:
1) prefabricated 14 center plates 1; Center plate 1 is that the rectangle standard steel plate of 6mm is cut out and formed by 14 block length 6000mm, wide 1500mm, thickness; And after the 14 block plates tilings each other overlap joint to form diameter be the circular flat bottom storage tank bottom plate of 10500mm, the base plate seam 11 that wherein adjacent center plate is 1 is and is dislocatedly distributed, and more adjacent center plate 1 spot welding is fixed; In order to reduce the welding deformation of center plate 1, at 1 iron block of adjacent center plate across the some 20Kg of placement;
2) the scallop balsh plate 21 that prefabricated 12 block sizes are identical, its thickness is 10mm, with the cylindrical tiling back formation annular edge listrium 2 of scallop balsh plate 21 along flat storage tank bottom plate, the inner ring surface of annular edge listrium 2 and the outer ring surface of flat storage tank bottom plate are complementary again;
3) length overall of the fanning strip seam 211 of 21 of adjacent scallop balsh plates is 600mm; Fanning strip seam 211 along adjacent scallop balsh plate 21 begins from the outside of annular edge listrium 2 inwardly partly to weld adjacent scallop balsh plate 21 one by one, and weld length is 200mm;
4) as shown in Figure 2; Cut-off directly is 12000mm cylindrical shape wallboard 3 coaxial being placed on the annular edge listrium 2, and the wall thickness of wallboard 3 is 10mm, and the weld seam that the scallop balsh plate in the step 3) is 21 has extended to the inboard of wallboard 3; As shown in Figure 3; The outside at wallboard 3 is carried out itself and 2 of annular edge listriums the discontinuous welding and is formed 75 sections short weld seams 4, and the length of each short weld seam 4 is 100mm, and the spacing of adjacent short weld seam 4 is 400mm;
5) as shown in Figure 4, the outer shroud seam 31 of 4 correspondences of adjacent short weld seam in the repair welding step 4) one by one makes the short weld seam 4 end to end backs of 2 of wallboard 3 and annular edge listriums form a closed circle;
6) in the inboard of wallboard 3 itself and 2 of annular edge listriums are carried out the discontinuous welding and form 75 sections short weld seams 4; The length of each short weld seam 4 is 100mm; The spacing of adjacent short weld seam 4 is 400mm; As shown in Figure 4, the interior articulating of 4 correspondences of the adjacent short weld seam of repair welding stitches 32 one by one again, makes the short weld seam 4 end to end backs of 2 of wallboard 3 and annular edge listriums form closed circles;
7) 21 long fanning strip seams 211 of remaining 400mm of the adjacent scallop balsh plate in the repair welding step 3) one by one;
8) as shown in Figure 6; 18 diagonal braces of being processed by angle steel 5 evenly are set between wallboard 3 and flat storage tank bottom plate earlier; The two ends of diagonal brace 5 respectively spot welding be fixed on inner ring surface and the flat storage tank bottom plate of wallboard 3 and with flat storage tank bottom plate angle be 45 °; Then flat storage tank bottom plate and 2 of annular edge listriums are carried out the discontinuous welding and form 66 sections short weld seams 4, the length of each short weld seam 4 is 100mm, and the spacing of adjacent short weld seam 4 is 400mm; The outer seam 12 of the base plate of 4 correspondences of the adjacent short weld seam of repair welding one by one again makes short weld seam 4 end to end one closed circles of formation afterwards of 2 of flat storage tank bottom plate and annular edge listriums;
9) 1 of 14 center plate on the flat storage tank bottom plate are carried out the discontinuous welding and form the short weld seam 4 of plurality of sections, the length of each short weld seam 4 is 100mm, and the spacing of adjacent short weld seam 4 is 400mm; As shown in Figure 5; When T font intersection appearred in the base plate seam 11 of adjacent center plate 1, the base plate seam 11 of T font cross section was directly carried out the part welding during this time, and three sections fusion lengths of cross section are 40mm; The base plate seam 11 of 4 correspondences of the adjacent short weld seam of repair welding one by one again; At first weld the length direction of center plate 1, weld the width of center plate 1 again, make the short weld seam 4 end to end backs on the every center plate 1 form a closed circle.
In welding process, constantly the hammering weld seam is to eliminate the residual stress on the weld seam, wherein step 1) and step 2) can exchange, step 3) to step 9) is in step 1) and step 2) carry out in proper order afterwards.
The deflection measurement data that subordinate list one welds for adopting conventional method, the deflection that subordinate list two welds for employing the inventive method is measured data.
Subordinate list one:
Subordinate list two:
Annotate: the point on the flat storage tank bottom plate is for randomly drawing, and particular location is as shown in Figure 1.
Specific embodiment described herein only is that design of the present invention is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (10)
1. one kind large-scale flat storage tank bottom plate welding method is characterized in that: comprise the steps:
1) prefabricated some center plates (1); Said center plate (1) is a rectangular steel plates; And form the circular flat bottom storage tank bottom plate by some center plates (1) tiling butt joint or overlap joint back, and be corresponding to the base plate seam (11) between adjacent center plate (1) and be dislocatedly distributed, more adjacent center plate (1) spot welding is fixed;
2) prefabricated some blocks of scallop balsh plates (21), with the cylindrical tiling back formation annular edge listrium (2) of scallop balsh plate (21) along flat storage tank bottom plate, the inner ring surface of said annular edge listrium (2) and the outer ring surface of flat storage tank bottom plate are complementary again;
3) the fanning strip seam (211) along adjacent scallop balsh plate (21) begins inwardly partly to weld one by one adjacent scallop balsh plate (21) from the outside of annular edge listrium (2);
4) get that cylindrical shape wallboard (3) is coaxial to be placed on the annular edge listrium (2); And the weld length in the step 3) between fan-shaped edge steel plate (21) extends to the inboard of wallboard (3), carries out the discontinuous welding and forms the short weld seam (4) of plurality of sections between itself and annular edge listrium (2) in the outside of wallboard (3);
5) corresponding outer shroud seam (31) between adjacent short weld seam (4) described in the repair welding step 4) one by one makes the end to end formation afterwards of short weld seam (4) one closed circle between wallboard (3) and annular edge listrium (2);
6) carry out the discontinuous welding and form the short weld seam (4) of plurality of sections between itself and annular edge listrium (2) in the inboard of wallboard (3); Corresponding interior articulating seam (32) between the adjacent short weld seam of repair welding (4) one by one makes the end to end formation afterwards of short weld seam (4) one closed circle between wallboard (3) and annular edge listrium (2) again;
7) remaining fanning strip seam (211) between the adjacent scallop balsh plate (21) in the repair welding step 3) one by one;
8) with carrying out the discontinuous welding between flat storage tank bottom plate and annular edge listrium (2) and forming the short weld seam (4) of plurality of sections; The corresponding outer seam (12) of base plate between the adjacent short weld seam of repair welding (4) one by one makes the end to end formation afterwards of short weld seam (4) one closed circle between flat storage tank bottom plate and annular edge listrium (2) again;
9) with carrying out discontinuous welding between the some center plates (1) on the flat storage tank bottom plate and form the short weld seam (4) of plurality of sections, during when intersecting appears in the base plate seam (11) of adjacent center plate (1), the base plate seam (11) of cross section is directly carried out part and is welded; Corresponding base plate seam (11) between the adjacent short weld seam of repair welding (4) one by one makes the end to end back formation of short weld seam (4) one closed-loop on the every center plate (1) again;
Wherein step 1) and step 2) can exchange, step 3) to step 9) is in step 1) and step 2) carry out in proper order afterwards.
2. large-scale flat storage tank bottom plate welding method according to claim 1 is characterized in that: weld length accounts for 1/3 to 1/2 of whole piece fanning strip seam (211) length in the said step 3).
3. large-scale flat storage tank bottom plate welding method according to claim 1 and 2; It is characterized in that: be 50mm to 150mm corresponding to single short weld seam (4) length of being interrupted welding in the said step 4), adjacent short weld seam (4) spacing is 3 to 6 times of single short weld seam (4) length.
4. large-scale flat storage tank bottom plate welding method according to claim 1 and 2 is characterized in that: said center plate (1) is a rectangular steel plates, at first welds the length direction of center plate (1) in the said step 9), welds the width of center plate (1) again; Every section fusion length of corresponding cross section was 30mm to 50mm when intersecting appearred in base plate seam (11).
5. large-scale flat storage tank bottom plate welding method according to claim 3 is characterized in that: at first weld the length direction of center plate (1) in the said step 9), weld the width of center plate (1) again; Every section fusion length of corresponding cross section was 30mm to 50mm when intersecting appearred in base plate seam (11).
6. large-scale flat storage tank bottom plate welding method according to claim 1 and 2; It is characterized in that: in said step 8); Between said wallboard (3) and flat storage tank bottom plate, increase diagonal brace (5); The two ends of diagonal brace (5) spot welding respectively are fixed on the inner ring surface of wallboard (3) and on the flat storage tank bottom plate, and diagonal brace (5) is 45 ° to 60 ° with flat storage tank bottom plate angle.
7. large-scale flat storage tank bottom plate welding method according to claim 5; It is characterized in that: in said step 6); Between said wallboard (3) and flat storage tank bottom plate, increase diagonal brace (5); The two ends of diagonal brace (5) spot welding respectively are fixed on the inner ring surface of wallboard (3) and on the flat storage tank bottom plate, and diagonal brace (5) is 45 ° to 60 ° with flat storage tank bottom plate angle.
8. large-scale flat storage tank bottom plate welding method according to claim 1 and 2 is characterized in that: horizontal weight above said flat storage tank bottom plate, and make weight across between adjacent center plate (1).
9. large-scale flat storage tank bottom plate welding method according to claim 7 is characterized in that: horizontal weight above said flat storage tank bottom plate, and make weight across between adjacent center plate (1).
10. large-scale flat storage tank bottom plate welding method according to claim 1 and 2 is characterized in that: continuous hammering weld seam in welding process.
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| CN2010105094416A CN102069307B (en) | 2010-10-15 | 2010-10-15 | Method for welding bottom plate of large flat-bottom storage tank |
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| CN2010105094416A CN102069307B (en) | 2010-10-15 | 2010-10-15 | Method for welding bottom plate of large flat-bottom storage tank |
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